Discussed this on the Discord like 2 years ago and should have filed an issue about it but I forgot, and only realised 2 years later that I forgot.

For the purposes of integrating e-Reader stuff with frontends, I want to be able to specify e-Reader dotcode files from the command line (presumably along with the e-Reader ROM) using the batch scanning feature, so something like:
mgba-qt e-Reader (USA).gba --dotcodes strip1.raw strip2.raw strip3.raw

Or perhaps --dotcode strip1.raw --dotcode strip2.raw1 etc if that's how parsing command line arguments works.

And then ideally one would then select Scan Card and it automagically scans all the cards, as though they were opened from the file menu. Bonus points if there is a way to avoid having to autofire/mash A to get through all the cards (having it automatically press the button when it's done scanning), though that might be another story and not entirely possible any time soon.

Bonus points if it would be possible to load an m3u file containing paths to multiple e-Reader dotcode files instead.